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Linux/arch/mips/pci/fixup-rbtx4927.c

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  1 /*
  2  *
  3  * BRIEF MODULE DESCRIPTION
  4  *      Board specific pci fixups for the Toshiba rbtx4927
  5  *
  6  * Copyright 2001 MontaVista Software Inc.
  7  * Author: MontaVista Software, Inc.
  8  *              ppopov@mvista.com or source@mvista.com
  9  *
 10  * Copyright (C) 2000-2001 Toshiba Corporation
 11  *
 12  * Copyright (C) 2004 MontaVista Software Inc.
 13  * Author: Manish Lachwani (mlachwani@mvista.com)
 14  *
 15  *  This program is free software; you can redistribute  it and/or modify it
 16  *  under  the terms of  the GNU General  Public License as published by the
 17  *  Free Software Foundation;  either version 2 of the  License, or (at your
 18  *  option) any later version.
 19  *
 20  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 21  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 22  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 23  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 24  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 25  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 26  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 27  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 28  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 29  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 30  *
 31  *  You should have received a copy of the  GNU General Public License along
 32  *  with this program; if not, write  to the Free Software Foundation, Inc.,
 33  *  675 Mass Ave, Cambridge, MA 02139, USA.
 34  */
 35 #include <linux/types.h>
 36 #include <asm/txx9/pci.h>
 37 #include <asm/txx9/rbtx4927.h>
 38 
 39 int __init rbtx4927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 40 {
 41         unsigned char irq = pin;
 42 
 43         /* IRQ rotation */
 44         irq--;                  /* 0-3 */
 45         if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
 46                 /* PCI CardSlot (IDSEL=A23) */
 47                 /* PCIA => PCIA */
 48                 irq = (irq + 0 + slot) % 4;
 49         } else {
 50                 /* PCI Backplane */
 51                 if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
 52                         irq = (irq + 33 - slot) % 4;
 53                 else
 54                         irq = (irq + 3 + slot) % 4;
 55         }
 56         irq++;  /* 1-4 */
 57 
 58         switch (irq) {
 59         case 1:
 60                 irq = RBTX4927_IRQ_IOC_PCIA;
 61                 break;
 62         case 2:
 63                 irq = RBTX4927_IRQ_IOC_PCIB;
 64                 break;
 65         case 3:
 66                 irq = RBTX4927_IRQ_IOC_PCIC;
 67                 break;
 68         case 4:
 69                 irq = RBTX4927_IRQ_IOC_PCID;
 70                 break;
 71         }
 72         return irq;
 73 }
 74 

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